My Inquiry
My Account
Microchip Technology AT49F002T-90JI
- Part No.:
- AT49F002T-90JI
- Manufacturer:
- Microchip Technology
- Category:
- Memory
- Package:
- 32-LCC (J-Lead)
- Datasheet:
-
AT49F002T-90JI.pdf
- Description:
- IC FLASH 2MBIT PARALLEL 32PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,864
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AT49F002T-90JI from Atmel is a 2-Mbit (256K × 8) 5V-only in-system reprogrammable Flash memory IC with 90 ns read access time, 10 µs typical byte programming, 10-second erase cycle, and industrial temperature range (−40°C to +85°C). It features sector architecture including a 16K-byte boot block with programmable lockout, two 8K-byte parameter blocks, and two main memory blocks (96K/128K bytes), used in embedded firmware storage and boot code retention.
For engineers reviewing the AT49F002T-90JI datasheet, AT49F002T-90JI pinout, AT49F002T-90JI application, or AT49F002T-90JI equivalent, this page delivers verified technical context, real-world use cases, validated alternatives, and supply-ready availability details for industrial-grade Flash memory selection.
Technical Context
The AT49F002T-90JI implements a command-based software-controlled architecture for erase and program operations, using standard microprocessor timing with WE/CE/OE control lines. Its sector erase capability targets specific memory regions-boot block (3C000–3FFFFH), parameter blocks (3A000–3BFFFH, 38000–39FFFH), and main memory blocks (20000–37FFFH, 00000–1FFFFH)-without requiring high-voltage programming inputs.
Hardware data protection includes VCC sense (<3.8 V inhibits programming), noise filtering (<15 ns pulses ignored), and control-line inhibition (OE low, CE high, or WE high blocks writes). Boot block lockout is enforced via 6-cycle command sequence and can be overridden only by applying 12 V ± 0.5 V to RESET-functionality confirmed exclusive to AT49F002T variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Density | 2 Mbit (262,144 × 8), organized as 256K words × 8 bits - supports full firmware image storage in compact 8-bit bus systems. |
| Read Access Time | 90 ns max - enables direct execution from Flash (XIP) in 8-MHz bus systems without wait states. |
| Byte Programming Time | 10 µs typical - allows rapid field updates of configuration parameters or calibration data without system interruption. |
| Erase Cycle Time | 10 seconds max - supports full-chip or sector-level erasure during maintenance mode with predictable downtime. |
| Operating Voltage | 5 V ± 10% - eliminates need for dedicated programming voltage rails; compatible with legacy 5V logic and power domains. |
| Temperature Range | −40°C to +85°C - qualified for industrial control, automotive body electronics, and outdoor embedded applications. |
| Standby Current | 100 µA CMOS - enables ultra-low-power retention in battery-backed systems during sleep or idle modes. |
| Write End Detection | DATA polling (I/O7 complement) and Toggle Bit (I/O6 toggling) - provides deterministic, software-driven program/erase completion signaling without external timers. |
Pinout & Package
AT49F002T-90JI is supplied in a 32-lead Plastic J-leaded Chip Carrier (PLCC) package (JEDEC MS-016 AE), with 1.27 mm pitch, 18.5 × 18.5 mm body, and lead finish suitable for reflow and wave soldering. Pin 1 is marked by index notch; pin 9 is DC (do not connect) per datasheet specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A17 | Address Inputs | 18-bit address bus supporting full 256K-word addressing; A0–A14 used for software ID and command entry. |
| CE | Chip Enable | Active-low chip select; must be low with OE low and WE high for valid read access; controls device selection on shared bus. |
| OE | Output Enable | Active-low output gate; used with CE to prevent bus contention; high-Z when deasserted. |
| WE | Write Enable | Active-low write strobe; latches address/data on falling/rising edges during command sequences and byte programming. |
| RESET | Reset Input | Active-low reset halts operations and forces outputs to high-Z; 12 V override enables boot block reprogramming after lockout. |
| I/O0–I/O7 | Data I/O Bus | Bi-directional 8-bit data path; carries command codes, product ID, and memory contents; supports DATA polling on I/O7 and Toggle Bit on I/O6. |
| VCC | Power Supply | +5 V ± 10% supply; powers core logic and I/O buffers; decoupling required within 1 cm of pin. |
| GND | Ground | Reference return for all signals and power; requires low-inductance connection to minimize noise coupling during erase/program cycles. |
Key Features
| Feature | Design Value |
|---|---|
| Sector Architecture with Boot Block Lockout | 16K-byte boot block (3C000–3FFFFH) protected via 6-cycle command; prevents accidental overwrite of critical startup code while allowing runtime updates to parameter and main memory blocks. |
| 5V-Only In-System Reprogrammability | Eliminates need for 12 V programming supplies; enables firmware upgrades over JTAG, UART, or SPI host interfaces using standard 5V system rails. |
| Hardware Data Protection | VCC sense, noise filtering, and control-line inhibition collectively prevent spurious writes during power transients, ESD events, or bus glitches. |
| DATA Polling & Toggle Bit | Dual, software-accessible status mechanisms allow precise synchronization of host firmware with internal Flash state-no fixed delays or external clocks required. |
| Industrial Temperature Qualification | Rated −40°C to +85°C with 50 mA active current and 100 µA standby current-enables reliable operation in motor drives, PLCs, and remote sensors without thermal derating. |
| 10,000 Program/Erase Cycles | Guaranteed endurance supports >5 years of daily field updates in diagnostic, logging, or calibration applications without wear-out concerns. |
Applications
| Industrial PLC Firmware Storage | Automotive Body Control Module Boot Code |
|---|---|
Use Scenario: Storing firmware images and configuration tables in programmable logic controllers operating in factory-floor environments with wide temperature swings and electrical noise. IC Role / Device Role / Timing Role: Nonvolatile program memory providing XIP-capable boot code and field-upgradable application logic with 90 ns read latency. Use Value: Sector lockout ensures bootloader integrity across 10,000+ field updates; 100 µA standby current extends uptime during brownout conditions. |
Use Scenario: Holding secure boot firmware and vehicle-specific calibration data in body control modules exposed to under-hood thermal stress and vibration. IC Role / Device Role / Timing Role: Trusted boot memory with hardware-enforced write protection for safety-critical initialization routines. Use Value: 12 V RESET override enables dealer-level reprogramming of locked boot sectors without component replacement; industrial temp rating ensures reliability at 85°C ambient. |
| Medical Diagnostic Equipment Parameter Storage | Network Router Configuration Memory |
Use Scenario: Retaining user-adjustable calibration constants, sensor offsets, and regulatory compliance settings in portable ultrasound and ECG devices. IC Role / Device Role / Timing Role: Byte-programmable nonvolatile memory enabling single-parameter updates without full firmware reload. Use Value: 10 µs/byte programming minimizes service interruption; DATA polling guarantees deterministic update completion for audit-trail logging. |
Use Scenario: Storing routing tables, security certificates, and firmware patches in enterprise-grade routers requiring zero-downtime configuration changes. IC Role / Device Role / Timing Role: Dual-sector parameter memory (8K × 2) isolates volatile config data from persistent firmware, enabling atomic updates. Use Value: Sector erase independence allows simultaneous background firmware upgrade and live config modification without memory corruption risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar Flash memory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SST39VF020-90-4C-NHE | 2 Mbit, 90 ns access, 3.3 V core (5 V tolerant I/O); no boot block lockout; 100,000 write cycles. | Lacks hardware boot protection and 12 V override; requires level-shifting in pure 5 V systems. | Select if lower power (18 mA active) and higher endurance outweigh boot security needs. |
| MX29LV020TC-90G | 2 Mbit, 90 ns, 3 V operation only; boot block size differs (8K vs 16K); no RESET-based override. | Not pin-compatible; incompatible voltage domain; requires redesign of power and interface circuitry. | Choose only for new 3 V designs where Atmel's 5 V ecosystem compatibility is unnecessary. |
Compared with SST39VF020-90-4C-NHE and MX29LV020TC-90G, the AT49F002T-90JI uniquely delivers 5 V-only operation with hardware-enforced boot block security and 12 V override-critical for industrial firmware integrity where voltage rail simplification and field-recoverability are design requirements.
Availability
AT49F002T-90JI is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, and medical diagnostic equipment requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.
Supply support for AT49F002T-90JI includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Atmel Corporation (now part of Microchip Technology) is a semiconductor manufacturer specializing in microcontrollers, Flash memory, and secure authentication ICs for industrial, automotive, and IoT applications.
The AT49F002T series belongs to Atmel's legacy 5V Flash memory product line, designed specifically for in-system reprogrammability in cost-sensitive, voltage-stable embedded systems requiring robust firmware storage and boot code protection.
FAQ
What is the boot block address range for AT49F002T-90JI?
The boot block for AT49F002T-90JI occupies address range 3C000H to 3FFFFH (16K bytes), distinct from the AT49F002(N) variant's 00000H–03FFFH mapping. This layout places boot code at the top of the memory map, simplifying linker script configuration and enabling hardware-assisted protection against accidental overwrite in the AT49F002T-90JI.
Does AT49F002T-90JI support 12 V programming on the RESET pin?
Yes, AT49F002T-90JI supports 12 V ± 0.5 V applied to the RESET pin to override boot block lockout-enabling chip erase, sector erase, or byte programming of the protected region. This feature is explicitly documented for AT49F002T variants and is not available on AT49F002N(T) or AT49F002NT derivatives.
How does DATA polling work on AT49F002T-90JI?
During byte programming, reading the last written address returns the complement of the loaded data on I/O7. Once programming completes, true data appears on all I/O lines. This allows host firmware to poll I/O7 without fixed delays-AT49F002T-90JI asserts valid data immediately upon tBP completion, enabling tight timing control in real-time update routines.
What package type is used for AT49F002T-90JI?
AT49F002T-90JI uses a 32-lead Plastic J-leaded Chip Carrier (PLCC) package (JEDEC MS-016 AE), with dimensions 18.5 × 18.5 mm and 1.27 mm lead pitch. Pin 9 is designated DC (do not connect), and the index notch identifies pin 1-confirmed in Atmel's official ordering information and packaging drawings.
Is AT49F002T-90JI pin-compatible with AT49F002-90JI?
No-AT49F002T-90JI and AT49F002-90JI are not pin-compatible due to differing boot block address mapping and RESET functionality. The AT49F002T-90JI locates its boot block at 3C000H–3FFFFH and supports 12 V RESET override, whereas AT49F002-90JI uses 00000H–03FFFH and lacks RESET-based override. Both share identical pinout and package but differ in internal memory organization and feature enablement.
AT49F002T-90JI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 32-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- FLASH
- Technology:
- FLASH
- Memory Size:
- 2Mbit
- Memory Organization:
- 256K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 50µs
- Access Time:
- 90 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TC)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-PLCC (13.97x11.43)
AT49F002T-90JI FAQ
1.How can I place an order for AT49F002T-90JI through Aetrix?
Please submit a Request for Quotation (RFQ) for AT49F002T-90JI on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for AT49F002T-90JI reliable?
The price and inventory of AT49F002T-90JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AT49F002T-90JI is usually 5 days.
3.What payment methods are accepted for AT49F002T-90JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AT49F002T-90JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AT49F002T-90JI?
AT49F002T-90JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AT49F002T-90JI order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for AT49F002T-90JI?
For technical support, including AT49F002T-90JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AT49F002T-90JI requirements.
6.How does Aetrix verify that AT49F002T-90JI is sourced from the original manufacturer or authorized distributors?
All AT49F002T-90JI products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AT49F002T-90JI meets industry standards.
7.What is the process for return or replacement of AT49F002T-90JI?
All AT49F002T-90JI units undergo pre-shipment inspection (PSI). If there is an issue with AT49F002T-90JI, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The AT49F002T-90JI part is unused and in its original packaging.
Return procedure for AT49F002T-90JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AT49F002T-90JI Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
